john-bodley commented on a change in pull request #9378: chore: bump black to 
19.10b0 and mypy to 0.770
URL: 
https://github.com/apache/incubator-superset/pull/9378#discussion_r402688153
 
 

 ##########
 File path: superset/connectors/druid/models.py
 ##########
 @@ -941,23 +941,24 @@ def metrics_and_post_aggs(
         adhoc_agg_configs = []
         postagg_names = []
         for metric in metrics:
-            if utils.is_adhoc_metric(metric):
+            if isinstance(metric, dict) and utils.is_adhoc_metric(metric):
 
 Review comment:
   I'm surprised this was necessary as it seems `is_adhoc_metric(metric)` can 
handle both a `dict` and `str`. I wonder in adding typing there, i.e., 
   
   ```python
   is_adhoc_metric(metric: Union[Dict[str, Any], str]) -> bool:
   ```
   
   would remove the need for `isinstance(metric, dict)` which is unnecessary. 

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